Bats wake up to hunt because their clock tells them it's dusk-summer or winter, no matter.

After six centuries, time has caught up with the world's oldest hand-wound clock.

Check the local tide level at a glance with this personalized tide clock.

That's the ticking of the clock-- although nobody really knows how the telomere clock might control cell division.

To the hands of the clock, it is the face going counterclockwise.

But when one team has had more time to adjust its biological clock than the other, the advantage begins.

Time enters mechanics as a measure of interval, relative to the clock completing the measurement.

There exists an alarm clock that doesn't beg to be thrown against walls and through windows.

You've got to dig through your closet and change clock after clock after clock.

British Dictionary definitions for clock

clock1

/klɒk/

noun

1.

a timepiece, usually free-standing, hanging, or built into a tower, having mechanically or electrically driven pointers that move constantly over a dial showing the numbers of the hours Compare digital clock, watch (sense 7)

2.

any clocklike device for recording or measuring, such as a taximeter or pressure gauge

3.

the downy head of a dandelion that has gone to seed

4.

an electrical circuit that generates pulses at a predetermined rate

5.

(computing) an electronic pulse generator that transmits streams of regular pulses to which various parts of the computer and its operations are synchronized

late 14c., clokke, originally "clock with bells," probably from Middle Dutch clocke (Dutch klok) "a clock," from Old North French cloque (Old French cloke, Modern French cloche), from Medieval Latin (7c.) clocca "bell," probably from Celtic (cf. Old Irish clocc, Welsh cloch, Manx clagg "a bell") and spread by Irish missionaries (unless the Celtic words are from Latin); ultimately of imitative origin.

Replaced Old English dægmæl, from dæg "day" + mæl "measure, mark" (see meal (n.1)). The Latin word was horologium; the Greeks used a water-clock (klepsydra, literally "water thief"). Image of put (or set) the clock back "return to an earlier state or system" is from 1862. Round-the-clock (adj.) is from 1943, originally in reference to bomber air raids.

"ornament pattern on a stocking," 1520s, probably identical with clock (n.1) in its older sense and meaning "bell-shaped ornament."

v.

"to time by the clock," 1883, from clock (n.1). The slang sense of "hit, sock" is 1941, originally Australian, probably from earlier slang clock (n.) "face" (1923). Related: Clocked; clocking.

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.Copyright (C) 2007 by HarperCollins Publishers.Cite This Source

clock in Technology

processor A circuit in a processor that generates a regular sequence of electronic pulses used to synchronise operations of the processor's components. The time between pulses is the cycle time and the number of pulses per second is the clock rate (or frequency). The execution times of instructions on a computer are usually measured by a number of clock cycles rather than seconds. Clock rates for various models of the computer may increase as technology improves, and it is usually the relative times one is interested in when discussing the instruction set. (1994-12-16)